/*
 * @(#)IterableView.java	1.0 May 3, 2008
 *
 *	The MIT License
 *
 *	Copyright (c) 2008 Malachi de AElfweald <malachid@gmail.com>
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *	THE SOFTWARE.
 */
package org.eoti.util;

import java.util.Iterator;

public abstract class IterableView<SOURCE,TARGET>
implements Iterable<TARGET>
{
	public static class StringView<SOURCE> extends IterableView<SOURCE,String>
	{
		public StringView(Iterable<SOURCE> source)
		{
			super(source);
		}

		public String getTarget(SOURCE source)
		{
			return source.toString();
		}
	}

	protected Iterable<SOURCE> source;

	public IterableView(Iterable<SOURCE> source)
	{
		this.source = source;
	}

	public Iterator<TARGET> iterator()
	{
		return new IterableViewIteror<SOURCE,TARGET>(this, source.iterator());
	}

	public abstract TARGET getTarget(SOURCE source);

	class IterableViewIteror<SOURCE, TARGET> implements Iterator<TARGET>
	{
		protected IterableView<SOURCE,TARGET> view;
		protected Iterator<SOURCE> source;
		public IterableViewIteror(IterableView<SOURCE,TARGET> view, Iterator<SOURCE> source)
		{
			this.view = view;
			this.source = source;
		}

		public boolean hasNext()
		{
			return source.hasNext();
		}

		public TARGET next()
		{
			return view.getTarget(source.next());
		}

		public void remove()
		{
			source.remove();
		}
	}
}
